Not all of Tchaikovsky's symphonies were named. They are:

No. 1 in G minor, Op. 13, Winter Daydreams(1866)
No. 2 in C minor, Op. 17, Little Russian (1872)
No. 3 in D major, Op. 29, Polish (1875)
No. 4 in F minor, Op. 36 (1877-1878)
Manfred Symphony, B minor, Op. 58; so named because it was inspired by Byron's poem Manfred (1885)
No. 5 in E minor, Op. 64 (1888)
No. 6 in B minor, Op. 74, Pathétique (1893)
Symphony in E flat (sketched 1892 but unfinished; reworked during the 1950s and later published as Symphony No. 7)

• Symphony No. 1 in C major, op. 21 (1799-1800)
• Symphony No. 2 in D major, op.36 (1802)
• Symphony No. 3 in E flat major, op.55, "Eroica", (1804)
• Symphony No. 4 in B flat major, op. 60, (1806)
• Symphony No. 5 in C minor, op. 67 (1807)
• Symphony No. 6 in F major, op. 68,"Pastoral" (1808)
• Symphony No. 7 in A major, op. 92, "The Apotheosis of Dance", (1812)
• Symphony No. 8 in F major, op.93 "The Little Symphony"(1812)
• Symphony No. 9 with a choir and soloists, in D minor, op.125 (1817-1825) - the 'Choral'.

Dvorak "From the New World", often referred to as the "New World Symphony", is Dvorak's Symphony no.9 in E minor. He composed it in 1893 while he was visiting the United States.

They are usually referred to by number:

# Symphony. no.1, C, op.21 (1800)

# Symphony. no.2, D, op.36 (1802)

# Symphony. no.3, 'Eroica', E♭, op.55 (1803)

# Symphony. no.4, B♭, op.60 (1806)

# Symphony. no.5, c, op.67 (1808)

# Symphony. no.6, 'Pastoral', F, op.68 (1808)

# Symphony. no.7, A, op.92 (1812)

# Symphony. no.8, F, op.93 (1812)

# Symphony. no.9, 'Choral', d, op.125 (1824)